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106. GUMIUSI l luus,

v silicious substances in suffieient proportions ,'plastic mass,"because"I contemplate using in ST ES eoMPosmcN or MAITER FOR I NSULA TING ELECT RIC counucmne. 7 v, t

, s ecimen-riot: forming part of Letters new 353,653] dated Ifl'oveniber r'o, iaaej. Y

ApplicationfiledA'vril28. 1886. Serial 80.200.461. imsmumnsi .To all whom it may concern: 7 1

Be.it known that I, CHARLES J. VAN Dr POELE, a citizen of the United States, residing at. Chicago, in" the conntyof Cook, State of 5 Illinois, have invented certain new and useful Improvements in Composition of Matter for Insulating Electric Conductors,of which the following is a description. I '45 My invention relates to a new and useful 10 composition of matter for the purpose of insulating electric conductors, the particulars of,whi ch'will be hereinafter fully set forth.

The principle ingredient of my improved insulating material is mica in a finely-divided state, and I propose to mix with it earthy and to form a thick pasty mass, 'which is then molded in-the desired shape and allowed to dry, after which the objects are soaked in boil ing oil to render them completely watenproof. Insome instances they are baked or burned to give therequisite strength. v The pulverized'mica and silicate of soda are the main elements in my insulating compound, the earthy material being added only to supply suffi cient pulverulent material to give the necessary homogeneity to the mass to produce i objects-possessing the desired strength.

7. It isnot always necessary that the insulator o shouldbe baked after being molded from the many instances plaster-of-paris in considerable proportions, the presence of which will give sufficient hardness without baking. The 5 ingredients are to be mixed by suitablemachinery and then forced i n to ppldsmhere they ,can be dried or baked accoi'dlhg" to circum- I j- Witnesses:

- stances. V i

; Some of the proportions in which I propose I as follows: Pulverized mica fifty parts sand or earthy suhsia n'c'e Hlty partssilicate of soda fionaannsa. vAn'DnPoELE,"orfenioA'e'o,i n NoIs,"

su men 0 orm a thick pas e. u ver "ed mica one hundredparts; laster-ofans 3 ity parfii; ocher ten partssilicate oiso'a"'enough to form a thick-paste. EUIVGIIZGE mica, one hundred parts; aris-w 1te y par ssive substance, su men 0 orm athick paste.

ocher ten parts; "I1me'- fen parts; sihca e o soda enough to form a thick 7 t w ll be understood from the foregoing that 5 5 pulverized mica and an earthy substance united by silicate of soda constitute the essential elements of my composition. and that for particular purposes many slight additions may be invention.

instead of the mica wltfi very goo"d result. l Having described .my invention, what I- isa A w 1. The hereindescribed insulating mat'erial consisting of pulverized mica silicate of soda, and an earthy substance, as set forth.

2; In insulating material composed of pul- 7o verized mica, silicate of soda, and a pulverulent earthy substance, substantially in the proportions stated. l V a In testimony whereof I affix my signature in presence of .two witnesses. j.

CHARLES .I'. VAN nni onmai.

AARON K. STILES,

0 to use the materials heretofore referred to, are

Jomv RIHOLLISTERQ 1,;

PATENT OFF CE; f

c er' ten, parts, silica te 0T soda glue or otheradhe: I

V Another modification of these portions and 50 materials is as follows; Pulverized mica one hundred parts; red, lead fen parEs,-"'y'e'llowpaste.- t

made without departing from the spirit of the 60,

In someinstances mineral wool maybeused claim, and desire to secure by Letters Patent, 65

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